The neurocranium of Potamotrygonidae: morphology and phylogenetic significance

Autor(es)

Araujo, Marcus V. G. ; Vaz, Diego F. B. ; Medeiros, Jade ; de Lima, Arthur ; Rosa, Ricardo S. ; Loboda, Thiago S. ; da Silva, Joao Paulo C. B.

• Tipo de documento: Artigo Científico
• Fonte: ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY; v. 202, n. 1, p. 24-pg., 2024-09-21.

Resumo

The family Potamotrygonidae is part of the Neotropical ichthyofauna and has the largest diversity of freshwater elasmobranchs in the world. The neurocranium in Potamotrygonidae is an elongated and dorsoventrally flattened structure that articulates anterolaterally with the anterior portion of the propterygium, posteriorly with the sinarcual, and posterolaterally with the hyomandibula. This anatomical structure is comparatively described in Potamotrygonidae in an effort to reveal new phylogenetically relevant characters. Additionally, a new genus-level phylogeny of the family is proposed herein based on 60 novel morphological characters. The subfamily Potamotrygoninae, whose monophyly is well sustained by previous studies, is further supported herein by a variable number of cranial synapomorphies (up to 17), depending on the optimization adopted. Furthermore, we also recovered Potamotrygon and Plesiotrygon as consecutive sister-groups to a clade including Heliotrygon and Paratrygon. The neurocranium of potamotrygonids and its anatomical variation is also discussed in the context of previous morphological and molecular phylogenies of Neotropical freshwater stingrays. (AU)

• Processo FAPESP: 05/52985-4 - Delimitação da espécie Potamotrygon falkneri Castex & Maciel, 1963, a partir da análise taxonômica do complexo falkneri-castexi (Chondrichthyes: Myliobatiformes: Potamotrygonidae)
• Beneficiário: João Paulo Capretz Batista da Silva
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 07/52193-6 - Revisão taxonômica e morfológica do complexo Potamotrygon orbignyi (Castelnau, 1855) (Chondrichthyes: Myliobatoformes): Potamotrygonidae
• Beneficiário: João Paulo Capretz Batista da Silva
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 10/52677-6 - Filogenia dos principais grupos de chondrichthyes baseada na anatomia comparada do esqueleto das nadadeiras e suas cinturas.
• Beneficiário: João Paulo Capretz Batista da Silva
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 22/12849-0 - Revisão sistemática e filogenética das arraias da família Potamotrygonidae Garman, 1877 (Chondrichthyes: Batoidea: Myliobatiformes), com inferências a respeito da origem e evolução do grupo
• Beneficiário: Thiago Silva Loboda
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado